EP 0957472 A2 19991117 - Speech coding apparatus and speech decoding apparatus
Title (en)
Speech coding apparatus and speech decoding apparatus
Title (de)
Vorrichtung zur Sprachkodierung und -dekodierung
Title (fr)
Dispositif de codage et décodage de la parole
Publication
Application
Priority
JP 14508798 A 19980511
Abstract (en)
A speech coding apparatus includes a spectrum parameter calculation section (200,210), an adaptive codebook section (500), a sound source quantization section (350;355;356;357,366), a discrimination section (370), and a multiplexer section (400). The spectrum parameter calculation section (200,210) receives a speech signal and quantizes a spectrum parameter. The adaptive codebook section (500) obtains a delay and a gain from a past quantized sound source signal using an adaptive codebook, and obtains a residue by predicting a speech signal. The sound source quantization section (350;355;356;357,366) quantizes a sound source signal using the spectrum parameter. The discrimination section (370) discriminates the mode. The sound source quantization section (350;355;356;357,366) has a codebook (351,352) for representing a sound source signal by a combination of non-zero pulses and collectively quantizing amplitudes or polarities of the pulses in a predetermined mode, and searches combinations of code vectors and shift amounts used to shift the positions of the pulses to output a combination of a code vector and shift amount which minimizes distortion relative to input speech. The multiplexer section (400) outputs a combination of outputs from the spectrum parameter calculation section (200,210), the adaptive codebook section (500), and the sound source quantization section (350;355;356;357,366). <IMAGE>
IPC 1-7
IPC 8 full level
G10L 19/08 (2013.01); G10L 19/10 (2013.01); G10L 19/12 (2013.01); G10L 19/22 (2013.01); H03M 7/30 (2006.01)
CPC (source: EP US)
G10L 19/012 (2013.01 - EP US); G10L 19/10 (2013.01 - EP US)
Designated contracting state (EPC)
DE FI FR GB SE
DOCDB simple family (publication)
EP 0957472 A2 19991117; EP 0957472 A3 20000223; EP 0957472 B1 20040728; CA 2271410 A1 19991111; CA 2271410 C 20041102; DE 69918898 D1 20040902; JP 3180762 B2 20010625; JP H11327597 A 19991126; US 6978235 B1 20051220
DOCDB simple family (application)
EP 99109442 A 19990511; CA 2271410 A 19990510; DE 69918898 T 19990511; JP 14508798 A 19980511; US 30239799 A 19990430